<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>定位</title>
</head>
<style>
  body {
    font-size: 60px;
  }

  .box1 {
    width: 200px;
    height: 200px;
    background-color: antiquewhite;
  }

  .box2 {
    width: 200px;
    height: 200px;
    background-color: orange;
    position: absolute;
    left: 300px;
    bottom: 200px;
  }

  .box3 {
    width: 200px;
    height: 300px;
    background-color: yellow;
  }
</style>

<body>
  <div class="box1">1</div>
  <div class="box2">2</div>
  <div class="box3">3</div>
</body>

</html>